FLEXSEAL TANDEM SEAL™ gaskets represent a breakthrough in fugitive emission control for critical flange connections. Engineered with two independent sealing elements — a PTFE-enveloped kammprofile inner ring plus a secondary outer seal — this dual barrier gasket delivers near-zero leakage performance in the most demanding oil & gas, petrochemical, and chemical processing applications.
Two independent sealing elements provide redundant protection against leakage.
Passed independent fire testing — maintains seal integrity under extreme conditions.
PTFE encapsulation withstands aggressive chemicals and corrosive media.
The FLEXSEAL TANDEM SEAL™ gasket is a high-performance semi-metallic gasket designed specifically for applications where leakage control is critical and fugitive emissions must be minimized. It combines a kammprofile (serrated) inner ring with a PTFE envelope and a secondary sealing element, creating a dual barrier sealing system that significantly reduces the risk of corrosion and erosion of the flange and pipe.
At Kaxite Sealing, a leading China FLEXSEAL TANDEM SEAL gasket manufacturer, we engineer every tandem seal gasket to meet the most stringent fugitive emission requirements. Our tandem seal gaskets are trusted by procurement engineers and EPC contractors across oil refineries, chemical plants, and power generation facilities in over 60 countries.
| Sealing Design | Dual Barrier / Tandem |
| Inner Element | Kammprofile + PTFE |
| Fire Test Standard | API-6FB |
| Pressure Class | Class 150 – Class 2500 |
| Temperature Range | −196°C to +260°C (PTFE) |
| MOQ | 50 pcs (standard sizes) |
| Lead Time | 15–20 business days |
The dual barrier design provides redundant protection — if the primary seal is compromised, the secondary seal maintains integrity.
Tandem seal arrangements have been proven to achieve near-zero emission rates for pumps and flanges handling light hydrocarbons.
Passed independent API-6FB fire testing — maintains sealing performance even after exposure to fire.
The PTFE envelope protects the metal core from aggressive chemicals and corrosive media, extending gasket life.
The kammprofile inner ring provides excellent recovery and compressibility through repeated heating and cooling cycles.
Two sealing elements significantly reduce corrosion and possible erosion of the flange and pipe.
Both are high-performance gaskets, but the FLEXSEAL TANDEM SEAL offers superior emission control and redundant sealing for critical applications.
Upgrade to TANDEM SEAL for applications where emission control and redundant safety are mission-critical.
Peace of mind. Dual barrier sealing means redundant protection — if one seal fails, the other holds.
Compliance. Near-zero emissions help you meet EPA and environmental regulations.
Custom parameters (non‑standard sizes, special alloys, custom dimensions) — available upon request.
Kaxite Sealing operates its own production facility in Zhenhai District, Ningbo, China.
ISO 9001:2025 and API-6FB fire-safe certified.
MTC per EN 10204 3.1 with batch-level traceability.
2-hour quote response for standard inquiries.
Exports to 60+ countries across six continents.
Any size, any material, any design — send us your flange drawing.
A dual barrier semi-metallic gasket combining a PTFE-enveloped kammprofile inner ring with a secondary sealing element for near-zero fugitive emissions.
API-6FB fire-safe certified.
TANDEM SEAL has dual barrier sealing (primary + secondary) for superior emission control and redundant protection.
Standard MOQ is 50 pieces for standard sizes. Custom sizes negotiable.
15–20 business days from order confirmation. Express available.
Yes. MTC per EN 10204 3.1 with full batch traceability.
Oil & gas, petrochemical, chemical processing, power generation, pharmaceutical, and marine.
Absolutely. Full custom fabrication — any size, any material, any design.
Sample orders are available. Contact our sales team for a sample quotation.
Yes. Full OEM and ODM services — manufactured to your brand and specifications.
Get a factory-direct quote within 2 hours — samples available upon request.
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Address
No 432 Zhenhai Middle Road, Luotuo Street, Zhenhai District, Ningbo City, Zhejiang China
